MUSCULAB - Laboratory of Neuromuscular Adaptations to Resistance Training, Department of Physical Education, Federal University of São Carlos, São Carlos, Brazil.
College of Healthcare Sciences, James Cook University, Townsville, Australia.
Eur J Sport Sci. 2020 Feb;20(1):125-134. doi: 10.1080/17461391.2019.1614680. Epub 2019 May 23.
The aim of this study was to compare if an acute exercise session of high-load resistance training (HL-RT, e.g. 70% of 1 repetition-maximum, 1 RM) induces a higher magnitude of muscle damage compared with a RT protocol with low-loads (e.g. 20% 1 RM) associated with partial blood flow restriction (LL-BFR), and investigate the recovery in the days after the protocols. We used an unilateral crossover research design in which 10 young women (22(2) y; 162(5) cm; 66(11) kg) performed HL-RT and LL-BFR in a randomized, counterbalanced manner with a minimum interval of 2 weeks between protocols. Indirect muscle damage markers were evaluated before and once a day for 4 days into recovery. Main results showed decreases of 8-12% at 24-48 h in maximal voluntary isometric and concentric contraction torques (< 0.03), and changes in muscle architecture markers ( < 0.03) for HL-RT and LL-BFR, with no differences between protocols (> 0.05). Moreover, delayed onset muscle soreness increased only after LL-BFR ( < 0.001). We conclude that an acute bout of low volume HL-RT or LL-BFR to failure resulted in edema-induced muscle swelling, but do not induce major or long-lasting decrements in muscle function and the level of soreness promoted from LL-BFR was mild.
本研究旨在比较高负荷阻力训练(HL-RT,例如 70%的 1 次最大重复次数,1RM)与低负荷(例如 20%的 1RM)联合部分血流量限制(LL-BFR)的 RT 方案是否会引起更大程度的肌肉损伤,并研究方案后几天的恢复情况。我们采用单侧交叉研究设计,其中 10 名年轻女性(22(2)岁;162(5)cm;66(11)kg)以随机、平衡的方式分别进行 HL-RT 和 LL-BFR,两次方案之间的最小间隔为 2 周。在恢复的 4 天内,每天一次评估间接肌肉损伤标志物。主要结果显示,24-48 小时时,最大自主等长和向心收缩扭矩降低了 8-12%(<0.03),肌肉结构标志物发生变化(<0.03),HL-RT 和 LL-BFR 之间无差异(>0.05)。此外,延迟性肌肉酸痛仅在 LL-BFR 后增加(<0.001)。我们得出结论,急性低容量 HL-RT 或 LL-BFR 至力竭会导致水肿引起的肌肉肿胀,但不会引起肌肉功能的重大或持久下降,并且 LL-BFR 引起的酸痛程度较轻。